In a downtown Manhattan courtroom, Assistant District Attorney Peirce Moser briefed a crowd of would-be jurors on what to expect over the four to six months it’ll take to try three former leaders of the law firm Dewey & LeBoeuf on criminal fraud charges.

The Weekend Profile: Diego Rodriguez was teaching Spanish at a middle school in Queens when the FBI recruited him 25 years ago. Now, he is the assistant director in charge of the bureau’s New York field office.

A federal judge allowed four men to pull their insider-trading guilty pleas, the latest fallout from a landmark appeals court ruling in December that put new limitations on prosecutors’ ability to pursue such cases.

In a blow to the Justice Department’s Wall Street crackdown, a federal appeals court overturned two insider-trading convictions and ruled it isn’t always illegal to buy or sell stocks using inside information.

Mathew Martoma, who worked for hedge-fund billionaire Steven A. Cohen, was sentenced to nine years in prison for taking part in what prosecutors said was one of the largest insider-trading schemes ever.

Two years before a jury acquitted Rengan Rajaratnam, dealing prosecutors their first defeat in a long-running campaign against insider trading, government lawyers had privately determined the case was weak.